/Engine/Source/Runtime/CoreUObject/Public/UObject/ClassTree.h
Retrieve the child nodes of this node that match the flags specified
template<class Comparator> void GetChildClasses ( [TArray](API\Runtime\Core\Containers\TArray)< [UClass](API\Runtime\CoreUObject\UObject\UClass) * > & ChildClasses, const Comparator & Mask, bool bRecurse ) const